A dissociative identity disorder has this characteristic:

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Dissociative identity disorder (previously known as multiple personality disorder) involves the splitting apart of a person's identity and sense of self, often as a coping mechanism to deal with trauma or abuse. This can include the splitting apart of painful experiences from conscious awareness, which is known as dissociation. Damage to the hippocampus (B) is not a known cause or symptom of this disorder, and while there may be some confusion between reality and fantasy (C), this is not the defining characteristic of dissociative identity disorder. Low self-esteem (D) may be present as a result of the trauma experienced, but it is not the primary characteristic of the disorder.

A Dissociative Identity Disorder Has This Characteristic